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An adjective is simply any word that describes a noun, such as an object or subject in a sentence. Of course, whole phrases may be used to describe nouns, but adjectives are individual words. In English, for example:

The red dog attacked the crazy fox.

An adjective can also be used in a sentence opposite a form of "to be." (called a predicate adjective)

Like nouns, adjectives in Latin are declined. The vast majority take either the first and second declension (antiquus -a -um) or the third declension (ferox, ferocis). All such adjectives must agree with the nouns they describe in gender, number, and case.

Most third declension adjectives do not have separate masculine and feminine forms. (Neuter adjectives follow the third declension neuter pattern.)

First and second declension adjectives have three distinct genders. Feminine adjectives require the first declension, masculine the second (masculine pattern), and neuter the second (neuter pattern).

Adjectives often come after the word they describe. Since word order is not central to the meaning of a Latin sentence the adjective may appear anywhere within the sentence. In poetry, for example, several words often separate an adjective from the noun it modifies.

For example:

Explanation- The good boy loves the wild dog.

Latin:

puer

bonus

amat(1)

canem(2) (acc)

ferocem(3) (acc).

English:

[The] boy

good

[he] loves

[the] dog

wild.

(1)amāre, [to] love. amat, [he] loves.

(2)canis, dog (masc.)

(3)ferox, ferocis, wild. ferocem (acc.)

Bonus, a first and second declension adjective, is masculine, nominative, and singular to agree with puer, the word it is describing.

Ferocem, a third declension adjective, is masculine, accusative, and singular to agree with canem. Canem is accusative because it is the object of amat.

Here is an example of plural adjectives:

Explanation- The good boys love the wild dogs.

Latin:

Puerī (plur)

bonī (plur)

amant (plur)

canes (plur, acc)

feroces (plur, acc).

English:

[The] boys

good

[they] love

[the] dogs

wild.

The words bonus and ferocem become boni and feroces to agree with the plurals pueri and canes.